Investigation of the impact of temperature on the stress-strain state of cylindrical elements in engineering structures (In Ukrainian)

Active development of monolithic-frame construction in the last period requires a new approach to the calculation of elements of building structures. Concrete columns are one of the most important elements of such buildings, the failure of which is of great durability. The loss of concrete column strength occurs as a result of a change in the gradient of the temperature field. Therefore, study related to the influence of temperature on the supporting elements is relevant and of great importance. The non-stationary temperature field in a concrete cylindrical column, which evolves due to high temperatures, was investigated. Boundary conditions of the third kind were considered when modeling the column heating process. Analytical expressions for studying the non-stationary temperature field were derived using Laplace transformation. The stress-strain state of the concrete column induced by the non-stationary temperature field was also determined. The graphic dependences of the radial, ring and axial stresses from the radius are researched as a result of the temperature fields of different intensities on the rod elements obtained.